在40年代,过程控制是基于3~15PSI的气动标准信号。其后,由于4~20mA模拟信号的使用,使得模拟控制器得到了广泛应用,但是并不是所有的传感仪表和驱动装置都使用统一的4~20mA信号。70年代,由于在检测、模拟控制和逻辑控制领域率先使用了计算机,从而产生了集中控制。进入80年代,由于微处理器的出现,促使工业仪表进入了数字化和智能化的时代,4~20mA模拟信号传输逐步被数字化通信代替,加之分布式控制以及网络技术的迅速发展,促进了控制、调度、优化、决策等功能一体化的发展。然而由于检测、变送、执行等机构大都采用模拟信号连接,其传送方式是一对一结构,这使得接线复杂,工程费用高,维护困难,而信号传输精度底,易受干扰,仪表互换性差,这都阻碍了上层系统的功能发挥。另一方面,由于智能仪表的功能远远超过了现场模拟仪表,如对量程和零点进行远方设定,仪表工作状态实现自诊断,能进行多参数测量和对环境影响的补偿等。由此可见,智能仪表和控制系统的发展,都要求上层系统和现场仪表实现数字通信。
YASKAWA ELECTRIC USAMED-30MA2T USAMED30MA2T
YASKAWA ELECTRIC E7BVB021 E7BVB021
YASKAWA ELECTRIC CIMR-P5U20450F CIMRP5U20450F
YASKAWA ELECTRIC CIMR-H3-0G2E-10 CIMRH30G2E10
YASKAWA ELECTRIC CACR-IR10101FC CACRIR10101FC
WILLIAMSON PRO-120-20-F-23 PRO12020F23
WESTINGHOUSE MD3B1NPFRG MD3B1NPFRG
WESTINGHOUSE 292B930A10 292B930A10
VIBRO METER CMC16 CMC16
TRICONEX 3006 3006
TOTAL CONTROL PRODUCTS QPI-CTA-E0000 QPICTAE0000
TEXAS INSTRUMENTS PLC 575-2104 5752104
TEXAS INSTRUMENTS PLC 565-2820 5652820
TELEMECANIQUE MPC-KT12NAX00N MPCKT12NAX00N
TB WOODS UVC-4050-0H UVC40500H
SYMAX 8030-ROM-121 8030ROM121
SSD DRIVES 955-8R0060 9558R0060
SQUARE D MEL36800LSG MEL36800LSG
SQUARE D ATV-58EU54N4 ATV58EU54N4
SQUARE D 1.5S1F 15S1F
SPECTRA TECH 912A036A 912A036A
SIEMENS HNFC366J HNFC366J
SIEMENS 6SE7-041-6ES87-0FA0 6SE70416ES870FA0
SIEMENS 6SE7-021-0EA61-Z-L20 6SE70210EA61ZL20
SIEMENS 6SC9-111-2GB15 6SC91112GB15
SIEMENS 6FX1-113-0AA02 6FX11130AA02
SIEMENS 6ES7-414-2XG01-0AB0 6ES74142XG010AB0
SIEMENS 6ES5-581-0EE15 6ES55810EE15
SIEMENS 6ES5-247-1AA11 6ES52471AA11
SIEMENS 6DS1-143-8AA 6DS11438AA
SIEMENS 6DS1-105-8AA 6DS11058AA
SIEMENS 6DD1-606-1AC0 6DD16061AC0
SIEMENS 3WN6231-0FC74-1FA1 3WN62310FC741FA1
SIEMENS 3TF6944-0CM7 3TF69440CM7
SIEMENS 1LA0364-2SP22 1LA03642SP22
SEIKO INSTRUMENTS & ELECS LTD OFL-760A-26 OFL760A26
SAFTRONICS SAF402.0140 SAF4020140
REXROTH PE110 PE110
REXROTH 0-608-830-141
RELIANCE ELECTRIC W/R-67100-B WR67100B
RELIANCE ELECTRIC VZ3000-DASR-1 VZ3000DASR1
RELIANCE ELECTRIC GV3000AC106 GV3000AC106
RELIANCE ELECTRIC GV3000-AC-043 GV3000AC043
RELIANCE ELECTRIC B/M-60031-1 BM600311
RELIANCE ELECTRIC 803456-3T 8034563T
RELIANCE ELECTRIC 61C-613 61C613
RELIANCE ELECTRIC 61C-160 61C160
RELIANCE ELECTRIC 57C-442 57C442
RELIANCE ELECTRIC 50P4161 50P4161
RELIANCE ELECTRIC 45C-15D 45C15D
RELIANCE ELECTRIC 0-60031-4B 0600314B
RELIANCE ELECTRIC 0-55325-37 05532537
RELIANCE ELECTRIC 0-48673-1 0486731
PROSOFT 3100-MCM 3100MCM
PHOENIX CONTACT IBS-IP-500-PS-2-BS IBSIP500PS2BS
PARKER 46987601L 46987601L
ORMEC MAC-B200F/K1A MACB200FK1A
OMRON V530-R160EP V530R160EP
NICOLET PROTEJE-460 PROTEJE460
NEMATRON CORP IWS-2513 IWS2513
NACHI ROP501 ROP501
NACHI ROP500 ROP500
MOORE PRODUCTS 39ACM28ADN 39ACM28ADN
MOORE PRODUCTS 352PEA21VNNNNAW 352PEA21VNNNNAW
MODICON PC-CBCA-000 PCCBCA000
MODICON AS-P890-300 ASP890300
MODICON AS-M507-016 ASM507016
MODICON AS-B807-132 ASB807132
MODICON AS-506P-F16 AS506PF16
MODICON AS-506P-005 AS506P005
MODICON AM-S980-800 AMS980800
MODICON AM-M909-023 AMM909023
MODICON AM-M909-002 AMM909002
MODICON 557VIC10200 557VIC10200
MODICON 140-CRP-931-00 140CRP93100
MODICON 140-CPU-534-14 140CPU53414
MODICON 140-CPU-434-12A 140CPU43412A
MODICON 140-CPU-434-12 140CPU43412
MODICON 140-CPU-213-04C 140CPU21304C
MIYACHI MM-730A MM730A
MITSUBISHI Q173CPU Q173CPU
MITSUBISHI HC-H703BS-A42 HCH703BSA42
MICROMASS LCT LCT
MEASUREX 51402089-100
MEASUREX 51198947-100
MARCONI ASX-1000-10AC ASX100010AC
MAGNETEK R762 R762
LOUIS ALLIS 46S1676-1010 46S16761010
LOUIS ALLIS 46S01676-0050 46S016760050
LENZE EVS9327-ESV906 EVS9327ESV906
KUNKLE 6252FLK01AS0020 6252FLK01AS0020
ITE SIEMENS PXD63B120 PXD63B120